@kirschner You can run a script when you plug in a certain device using a udev rule. Then you can create a script to tell pulseaudio (or alsa or whatever you're using) to disable the mic or to set your internal mic as the default.
@kirschner If you are using Pulseaudio, you can change the device's profile to "Off". This works across unplugs for me. (See screenshot from pavucontrol.)
@nwalfield That worked, thanks a lot -- also to all the others for the suggestions.
Before posting I found the solution also described by @gchaincl https://mastodon.social/@gchaincl/105712870205494974 but that did not survive reconnects of the webcam like the solution in the "Configuration" tab.
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